diff --git a/sugar/graphics/toggletoolbutton.py b/sugar/graphics/toggletoolbutton.py
index 74e78a60..72a6c843 100644
--- a/sugar/graphics/toggletoolbutton.py
+++ b/sugar/graphics/toggletoolbutton.py
@@ -41,7 +41,7 @@ class ToggleToolButton(gtk.ToggleToolButton):
         self._palette.props.invoker = WidgetInvoker(self.child)
 
     def set_tooltip(self, text):
-        self._set_palette(Palette(text))
+        self.set_palette(Palette(text))
     
     def do_expose_event(self, event):
         if self._palette and self._palette.is_up():